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Note 4 - Investments (Tables) | 12 Months Ended
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Apr. 30, 2021
Notes Tables |
Debt Securities, Trading, and Equity Securities, FV-NI [Table Text Block] |
($ in thousands) |  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
ETFs - equities |  | $ | 19,105 |  |  | $ | 4,532 |  |  | $ | (55 | ) |  | $ | 23,582 |
($ in thousands) |  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
ETFs - equities |  | $ | 12,877 |  |  | $ | 1,317 |  |  | $ | (69 | ) |  | $ | 14,125 |
Schedule of Available-for-sale Securities Reconciliation [Table Text Block] |
|  | Amortized |  |  | Gross Unrealized |  |  |  |  |
($ in thousands) |  | Historical Cost |  |  | Holding Gains |  |  | Fair Value |
Maturity |  |  |  |  |  |  |  |  |  |  |  |
Due within 1 year |  | $ | 2,596 |  |  | $ | 4 |  |  | $ | 2,600 |
Total investment in government debt securities |  | $ | 2,596 |  |  | $ | 4 |  |  | $ | 2,600 |
|  | Amortized |  |  | Gross Unrealized |  |  |  |  |
($ in thousands) |  | Historical Cost |  |  | Holding Gains |  |  | Fair Value |
Maturity |  |  |  |  |  |  |  |  |  |  |  |
Due within 1 year |  | $ | 14,652 |  |  | $ | 177 |  |  | $ | 14,829 |
Due 1 year through 5 years |  |  | 250 |  |  |  | - |  |  |  | 250 |
Total investment in government debt securities |  | $ | 14,902 |  |  | $ | 177 |  |  | $ | 15,079 |
Investment Income [Table Text Block] |
|  | Fiscal Years Ended April 30, |
($ in thousands) |  | 2021 |  |  | 2020 |  |  | 2019 |
Dividend income |  | $ | 573 |  |  | $ | 352 |  |  | $ | 257 |
Interest income |  |  | 137 |  |  |  | 279 |  |  |  | 201 |
Investment gains/(losses) recognized on sales of equity securities during the period |  |  | 835 |  |  |  | (1,075 | ) |  |  | - |
Unrealized gains/(losses) recognized on equity securities held at the end of the period |  |  | 3,875 |  |  |  | (339 | ) |  |  | 1,087 |
Other |  |  | - |  |  |  | (6 | ) |  |  | 46 |
Total investment gains/(losses) |  | $ | 5,420 |  |  | $ | (789 | ) |  | $ | 1,591 |
Investment Holdings, Other than Securities [Table Text Block] |
|  |  | Fiscal Years Ended April 30, |
($ in thousands) |  | 2021 |  |  | 2020 |  |  | 2019 |
Investment management fees earned from the Value Line Funds, net of waivers shown below |  | $ | 29,022 |  |  | $ | 21,985 |  |  | $ | 16,715 |
12b-1 fees and other fees, net of waivers shown below |  | $ | 9,604 |  |  | $ | 8,436 |  |  | $ | 6,811 |
Other income |  | $ | 361 |  |  | $ | (156 | ) |  | $ | 273 |
Investment management fee waivers and reimbursements |  | $ | 121 |  |  | $ | 302 |  |  | $ | 421 |
12b-1 fee waivers |  | $ | 651 |  |  | $ | 667 |  |  | $ | 654 |
Value Line's non-voting revenues interest |  | $ | 15,190 |  |  | $ | 11,184 |  |  | $ | 8,260 |
EAM's net income (1) |  | $ | 4,262 |  |  | $ | 2,332 |  |  | $ | 2,098 |
Summary Investment Holdings [Table Text Block] |
|  | Fiscal Years Ended April 30, |
($ in thousands) |  | 2021 |  |  | 2020 |
EAM's total assets |  | $ | 64,197 |  |  | $ | 61,335 |
EAM's total liabilities (1) |  |  | (6,870 | ) |  |  | (4,192 | )
EAM's total equity |  | $ | 57,327 |  |  | $ | 57,143 |

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